The factory replacement parts you can get from Smith and Wesson, as they now own Walther Gmbh. Any aftermarket parts, you can get from the internet. Just Google "walther P22 parts" or if you are looking for something specific then enter that parts instead of parts. Its not hard to find the few parts that are being made for it.
Umarex is the company that handles Walther PPK/s Airguns. I would contact them first. (See the links below.) You can also try air gun repair shops around the country. (See the link below)
The most common hand gun used in James Bond is, The Walther PPK.
7.65x17SR IS .32 ACP
You can try JG Airguns, they have a few parts. You can also place a "wanted" ad on an airgun forum. LG 55 parts are scarce, but still around. Another idea is to buy a "beater" LG55 or a parts gun for the parts you need.
22 Long Rifle
you probably mean PPK or PPK/S which is a Walther hand gun in 22 cal, 32 cal or 380 cal.
200-600 depending on condition and EXACT model.
I believe you are asking about a Walther PPK/S made by Umarex. I would contact Umarex directly and ask them at Customer Service. See the link below.
Walther, earl's repair service, gun shop, want ad, gun show
100-600 USD depending on specifics
You have to be 18 to buy a long gun and 21 to buy a hand gun.
I had to buy a gun to break. Don't have it now. I do have a parts list from Stevens i.e. exploded diagram. Not much use unless you can source a second hand gun or part.